Clutch.



2 Sheets-Sheet L atzanzey Paten'ted Dec. l6, I902. .W. S. GRAHAM.CLUTCH. (Application filed June 5, 1902.)

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W; S. GRAHAM;

CLUTCH.

(Application filed June 5, 1902,)

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ATENT Prion.

WILLIAM S. GRAHAM OF CANTON, ILLINOIS, ASSIGNOR TO PARLIN AND ORENDORFFCOMPANY, OF CANTON, ILLINOIS, A CORPORATION OF ILLINOIS.

CLUTCH.

SPECIFICATION forming part of Letters Patent No. 716,219, dated December16, 1902. Application filed June 5, 1902. Serial No. 110,385. iNomodel.)

To ctZZ whom it may concern: 1

Be it known that '1, WILLIAM S. GRAHAM, of the city of Canton, county ofFulton, and State of Illinois, have invented certain new and usefulImprovements in Clutches, of.

. fication, Figure 1 is a plan of so much of a. zoplanter as is neededto show my inventionf Fig. 2 is a side elevation of the clutch,show ingthe clutch members separated. Fig. 3 is a side elevation of the clutch,showing the members thereof engaged or in mesh.

A drill-shaft is shown at 1, and a checkrow shaft at 2. 3 represents asprocketwheel, which is journaled on shaft 1 and driven by a chain 29,which receives motion from the covering-Wheelsof a planter in the,

3,0 usual manner. A clutch-rim 4 projects laterally from the face of thesprocket-wheel,

and the perimeter of the rim is externally corrugated or provided with aset of crosswise-extending concavities. A stoparm is 5 attached to shaft1 alongside the ratchet-r1 m and such stop-ar1n is duplex in general.construction, in this particular instance one branch or extension beingshown at 9 and the other at 10. The stop projection for ex- 0 tension 10is shown at 14. Anincline 13 is formed on extension 9 of the stop-arm inadvance of stop projection 11, and a concavity 12 is formed in theincline immediately in front of the stop projection. The extension 10 issimilarly provided with an incline and a concavity therein. Theextension10 of the stop-arm is aduplicate of extension 9, and the position of oneextension is diametrically opposite the position of the other extension.

so A lug 5 is formed on the stop-arm. It 'projects from the shaft atapproximate right angles with the face of the arm, and it provides apivot 28 for a releasable clutch member 6. The releasable clutch memberis duplex in general construction in this instance, and one of its endsis provided with a laterally-extended roller or cylindrical bearing 7,which is adapted to engage the concavities of the clutch-rim 4. Each endof the releasable clutch member has a trip-nose, as 8, bymeans of whichthe roller 7 is pressed from contact with the clutch-rim, and a spring24 connects the releasable clutch member with an extension 23 of thestop-arm and tends to hold the trip-noses in advance of the stopprojections 11 and 14. A throw-out arm 15 hasa laterally-extendingstop-pin 16, (shown only in dotted lines,) and when such pin is in thepath of the trip-noses of the releasable clutch member and the stopprojections of the stoparm it will first swing the releasable memberclear of the clutch-rim and then stop the rotation of shaft 1. The arm15 has an extension 17 beyond pin 16, and an arm 18 on the check rowshaft 2 is hooked at 19 to engage the extension 17 of the throw-out arm.A spring 21 connects at one end with an extension 20 of arm 18 and atthe other end with an extension 22 of arm 15, thereby tending to holdthe arms in the position shown in Fig. 2. When the check-row shaft 2 isrocked backward, as shown in Fig. 3, the hooked end 19 of arm 18 willpress downward on extension 17 of the throw-out arm and carry the pin 16from engagement with a trip-nose of the releasable clutch member and astop projection of the stop-arm. As soon as that is done the spring 24will advance the trip-noses with relation to the stop projections andcarry roller 7 into engagement with the clutchrim 4. The check-row shaftreturns to its original position immediately after being rockedbackward, and the throw-out pin 16 is at once returned to an operativeposition. When the shaft 1 has completed a one-half rotation, thetrip-nose opposite the one formerly engaged strikes the pin 16 and isforced by theresistance of the pin to carry the clutch-roller 7 fromcontact with the clutch-wheel. As the clutch approaches a stop positionan incline 13 of the stop-arm presses the stop-pin outward a slightdistance, and when a stop is completely effected the pin is forced intodepression12 and the clutch members are forced apart.

The object of making the stop-arm and the releasable clutch member induplicate is to enable the drill-shaft to be stopped at onehalfrotations instead of making complete rotations, as in clutchesheretofore constructed. This provision somewhat lessens the work ofturning the shaft, and it reduces the jar incident to the stopping ofthe shaft. The gear between the shaft 1 and the dropping-Wheels of theseedboxes is so proportioned that a one-half rotation of the shaft movesthe seedwheels sufficiently far to deliver the number of grains requiredin a hill into a shank of the planter in this particular instance; butit will be obvious that a complete rotation of shaft 1 may be used todrop a hill from a seedbox, and in that instance but one of thetrip-noses would be required on the releasable clutch member.

By forming the corrugations on the external surface of the clutch-rimthe number of corrugations of a certain width is greater on a wheel of acertain diameter than if the corrugations were made in the inner rim,which lessens the dis-arrangement incident to slippage of the clutch, orfailure to engage, there is no tendency for the clutch-Wheel toaccumulate and retain dirt or trash on its operative surface and theaction of the wheel on the shiftable clutch member is in the nature of apull instead of the push developed in wheels having the ratchetcorrugations inside a rim of the wheel. Moreover,the clutch-bearings maybe placed farther from the center of the wheel in .a wheel of a certainsize by forming the corrugations outside the rim, and the clutch may bebroken or disengaged by a shorter movement of the trip end of theshiftable clutch member.

The arm 18 on the check row shaft is shorter than the throw-out arm 15and the stop-pin 16 is between the ends of the throwout arm. As a resultof this arrangement the stop-pin moves so slowly or so short a dis:tance that it does not swing clear of the nose of the releasable clutchmember until the check-row shaft has about completed its work ofdischarging the seed from the second or final drop. This assures thereturn of the intermediate valve to a seed-intercepting position beforethe first drop begins to drop seed.

The spring 21 performs the double function of retracting the check-rowshaft after an operative throw thereof and of holding the throw-out armfor the clutch in position to engage the releasable clutch member.

I claim- 1. In a clutch, the combination of a shaft, anexternally-corrugated wheel journaled on the shaft, a pivot-bearingsecured to the shaft eccentric with the wheel and inside the perimeterthereof, a clutch-arm swung on the pivot-bearing and extended beyond theperimeter of the wheel, a lateral extension on the clutch-arm outsidethe wheel, such extension being adapted to engage the external surfaceof the wheel, a spring tending to hold the arm in engagement with thewheel, and a throwout to disengage the arm from the wheel.

2. In a clutch, the combination of a shaft, an externally-corrugatedwheel journaled on the shaft, a pivot-bearing secured to the shafteccentric with the wheel, a clutch-arm swung between its ends on thepivot-bearing, a lateral extension on the clutch-arm adapted to engagethe external surface of the wheel, a spring tending to hold the arm inengagement with the wheel, a throw-out to disengage the arm from thewheel, and a trip-nose on each end of the arm, adapted to strike thethrowout and stop the shaft 'after each semirotation.

3. In a clutch, the combination of a shaft, an externally-corrugatedwheel journaled on the shaft, a pivot-bearing secured to the shafteccentric with the wheel, a stop-arm fixed between its ends on theshaft, and having a stop projection at each end, a clutch-arm swungbetween its ends on the pivot-bearing, a lateral extension of theclutch-arm adapted to engage the external surface of the wheel, a springtending to hold the lateral extension in engagement with theclutch-wheel and also hold the trip-noses in advance of the stopprojections, and a throw-out to engage the tripnoses and the stopprojections, to release the clutch and stop the shaft.

4. In a clutch, the combination of a shaft, a clutch-wheel journaled onthe shaft,a clutcharm journaled between its ends eccentric of the shaftand adapted to engage the wheel, and a throw-out to engage either end ofthe clutch-arm and detach the arm from the wheel on semirotations of theshaft.

5. In a clutch, the combination of a shaft; an externally-corrugatedwheel journaled on the shaft; a stop-arm havinga stop projection, anincline in front of the stop projection and a concavity between theincline and the stop projection; a clutch-arm adapted to engage theexternal surface of the wheel; a throwout arm, and an extension of thethrow-out arm adapted to ride up the incline of the stoparm and rest inthe concavity in the act of releasing the clutch-arm.

6. In a clutch, the combination of a clutchwheel, a releasable clutchmember, a throwout arm, a rock-shaft, an arm on the rockshaft adapted'tomove the throw-out arm, and a spring connecting at one end with thethrow-out arm and at the other end with the arm on the rock-shaft.

In testimony whereof Isign my name in the presence of two subscribingWitnesses.

WM. S. GRAHAM.

WVitnesses:

WALTER B. BARNEY, CARL B. CHANDLER.

